EP0516599B1 - Device in hammer machines - Google Patents

Device in hammer machines Download PDF

Info

Publication number
EP0516599B1
EP0516599B1 EP92850084A EP92850084A EP0516599B1 EP 0516599 B1 EP0516599 B1 EP 0516599B1 EP 92850084 A EP92850084 A EP 92850084A EP 92850084 A EP92850084 A EP 92850084A EP 0516599 B1 EP0516599 B1 EP 0516599B1
Authority
EP
European Patent Office
Prior art keywords
drill bit
channel
machine housing
hammer
hammer piston
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92850084A
Other languages
German (de)
French (fr)
Other versions
EP0516599A1 (en
Inventor
Jörgen Rodert
Kurt Andersson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uniroc AB
Original Assignee
Uniroc AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uniroc AB filed Critical Uniroc AB
Publication of EP0516599A1 publication Critical patent/EP0516599A1/en
Application granted granted Critical
Publication of EP0516599B1 publication Critical patent/EP0516599B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
    • E21B7/208—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes using down-hole drives

Definitions

  • the present invention relates to a device in hammer machines for drilling, preferably in rock, by means of a drill string comprising a set of tubes and a set of rods arranged in the set of tubes.
  • the present invention aims at achieving a device in hammer machines where the stress at the channel between the external surface of the rod and the central flushing channel is substantially reduced in order to improve the service life of the rod. It has surprisingly turned out that the drilling rate is not affected in any essential degree if the length of the drill bit and the adjacent rod is increased moderately. This deviates considerably from accepted opinions which say that the length of the drill bit and the adjacent rod together should be equal to the length of the hammer piston. It has turned out to be advantageous if the distance from the front end of the drill bit to the channel between the external surface of the rod and the central flushing channel is 5-10% larger than the length of the hammer piston.
  • the device shown in the drawing comprises a hammer machine which is provided with a machine housing 1 and a hammer piston 2 having a length L and being movable to-and-fro in the machine housing.
  • a drilling tool comprising a set of tubes 4, a set of rods arranged therein and a drill bit 5, is connected to the hammer machine.
  • the set of tubes comprises a number of tubes which during drilling are connected with each other by means of thread connections 14.
  • the set of rods comprises a number of rods loosely resting against each other for transferring the impact energy of hammer piston 2 to drill bit 5.
  • Drill bit 5 is by means of a splined coupling 12 connected with the set of tubes 4. The set of tubes and thus the drill bit 5 is rotated by a rotation device 10.
  • the drill bit is provided with an end 9 which is turned away from the machine housing 1 and an axial flushing channel 6. Adjacent to the drill bit a rod 11 forming part of the set of rods 3 is arranged. Rod 11 is provided with an axial channel 7 and a further channel 8 which connects the axial channel with the external surface of the rod. Flushing medium for removal of drill cuttings is supplied through the space between the set of rods and the set of tubes to the further channel 8 and from there through channels 7 and 6 to the front surface 9 of the drill bit.
  • the set of tubes 4 is provided with guides 15 for the set of rods 3. These guides are provided communications 13 for passage of flushing medium.
  • the distance S between the end 9 of the drill bit turned away from the machine housing and channel 8 is larger than the length L of hammer piston 2. Through this it is ensured that the shock wave generated by the hammer piston passes channel 8 before the reflex from the rock reaches channel 8.
  • the distance S is suitably 5-10% larger than the length L of hammer piston 2.

Abstract

Device in hammer machines. The device comprises a machine housing (1) and a hammer piston (2) movable to-and-fro in the machine housing. A drilling tool connected to the machine housing comprises a drill bit (5), a set of tubes (4) for rotating the drill bit and a set of rods (3) for transferring impact energy to the drill bit. A rod (11) situated adjacent to the drill bit is procided with an axial channel (7) and a radial channel (8) for supplying flushing medium to the flushing channel (6) of the drill bit. The distance (S) from the front end (9) of the drill bit to channel (8) is larger than the length (L) of the hammer piston (2). <IMAGE>

Description

  • The present invention relates to a device in hammer machines for drilling, preferably in rock, by means of a drill string comprising a set of tubes and a set of rods arranged in the set of tubes.
  • When drilling with drill strings of the above mentioned kind, see SE-A-8900590-4, one has used drill strings where the drill bit and the rod closest to the drill bit together have a length which is equal to the length of the hammer piston in order to efficiently transfer the energy of the hammer piston to the drill bit. The rod adjacent to the drill bit is provided with a channel which connects the external surface of the rod with a centrally positioned channel through which flushing medium is supplied to the drill bit. It has turned out that this build-up of the drill string in drilling creates large stresses in the rod at the channel between the external surface and the central channel.One reason for this is that the shock wave from the hammer piston has not passed the channel between the external surface and the central channel before the reflex from the rock reaches this section.
  • The present invention, which is defined in the subsequent claims, aims at achieving a device in hammer machines where the stress at the channel between the external surface of the rod and the central flushing channel is substantially reduced in order to improve the service life of the rod. It has surprisingly turned out that the drilling rate is not affected in any essential degree if the length of the drill bit and the adjacent rod is increased moderately. This deviates considerably from accepted opinions which say that the length of the drill bit and the adjacent rod together should be equal to the length of the hammer piston. It has turned out to be advantageous if the distance from the front end of the drill bit to the channel between the external surface of the rod and the central flushing channel is 5-10% larger than the length of the hammer piston.
  • An embodiment of the invention is described below with reference to the accompanying drawing which schematically shows a rock drilling device according to the invention.
  • The device shown in the drawing comprises a hammer machine which is provided with a machine housing 1 and a hammer piston 2 having a length L and being movable to-and-fro in the machine housing. A drilling tool, comprising a set of tubes 4, a set of rods arranged therein and a drill bit 5, is connected to the hammer machine. The set of tubes comprises a number of tubes which during drilling are connected with each other by means of thread connections 14. The set of rods comprises a number of rods loosely resting against each other for transferring the impact energy of hammer piston 2 to drill bit 5. Drill bit 5 is by means of a splined coupling 12 connected with the set of tubes 4. The set of tubes and thus the drill bit 5 is rotated by a rotation device 10. The drill bit is provided with an end 9 which is turned away from the machine housing 1 and an axial flushing channel 6. Adjacent to the drill bit a rod 11 forming part of the set of rods 3 is arranged. Rod 11 is provided with an axial channel 7 and a further channel 8 which connects the axial channel with the external surface of the rod. Flushing medium for removal of drill cuttings is supplied through the space between the set of rods and the set of tubes to the further channel 8 and from there through channels 7 and 6 to the front surface 9 of the drill bit. The set of tubes 4 is provided with guides 15 for the set of rods 3. These guides are provided communications 13 for passage of flushing medium. In order to decrease the stresses in the material at channel 8 the distance S between the end 9 of the drill bit turned away from the machine housing and channel 8 is larger than the length L of hammer piston 2. Through this it is ensured that the shock wave generated by the hammer piston passes channel 8 before the reflex from the rock reaches channel 8. The distance S is suitably 5-10% larger than the length L of hammer piston 2.

Claims (2)

  1. Device in hammer machines comprising a machine housing (1), a hammer piston (2) movable to-and-fro in the machine housing and arranged for delivering impacts against a tool, and a rotation device (10) for rotating the tool, the tool comprising a drill bit (5) provided with an axial flushing channel (6), a central set of rods (3) for transferring impact energy from the hammer piston to the drill bit, a set of tubes (4) about the set of rods for transferring rotation from the rotation device to the drill bit, and a rod (11) adjacent to the drill bit and provided with an axial channel (7) and a further channel (8) which connects said axial channel with the external surface of the rod, characterized in that the distance (S) between the end (9) of the drill bit (5) turned away from the machine housing (1) and said further channel (8) is larger than the length (L) of the hammer piston.
  2. Device according to claim 1, characterized in that the distance (S) between the end (9) of the drill bit (5) turned away from the machine housing (1) and said further channel (8) is 5-10% larger than the length (L) of the hammer piston.
EP92850084A 1991-05-30 1992-04-13 Device in hammer machines Expired - Lifetime EP0516599B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101639 1991-05-30
SE9101639A SE468443B (en) 1991-05-30 1991-05-30 Flushing channel device for striking machines for drilling

Publications (2)

Publication Number Publication Date
EP0516599A1 EP0516599A1 (en) 1992-12-02
EP0516599B1 true EP0516599B1 (en) 1996-09-04

Family

ID=20382883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92850084A Expired - Lifetime EP0516599B1 (en) 1991-05-30 1992-04-13 Device in hammer machines

Country Status (11)

Country Link
US (1) US5207280A (en)
EP (1) EP0516599B1 (en)
JP (1) JP3242445B2 (en)
AT (1) ATE142305T1 (en)
AU (1) AU647924B2 (en)
CA (1) CA2067616C (en)
DE (1) DE69213331T2 (en)
ES (1) ES2093240T3 (en)
FI (1) FI97417C (en)
SE (1) SE468443B (en)
ZA (1) ZA923100B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE513325C2 (en) * 1998-04-21 2000-08-28 Atlas Copco Rock Drills Ab percussion
SG97991A1 (en) * 1999-12-03 2003-08-20 Tone Kk Multiple air hammer apparatus and excavating direction correcting method therefor
SE519809C2 (en) * 2000-11-27 2003-04-08 Atlas Copco Rock Drills Ab Device for cracking boulders
KR20040050415A (en) * 2002-12-10 2004-06-16 (주) 소암컨설턴트 An impact wave generator for detecting a geological stratum
US20110180330A1 (en) * 2010-01-26 2011-07-28 Conn Timothy W Drilling assembly with underreaming bit and method of use
US20110253456A1 (en) * 2010-04-16 2011-10-20 Conn Timothy W Reverse circulation hammer with modular bit

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1115898A (en) * 1914-03-28 1914-11-03 Andrew J Carter Hammer-drill.
US2951467A (en) * 1958-11-06 1960-09-06 Ingersoll Rand Co Rock drill
US3050032A (en) * 1960-12-30 1962-08-21 Carey Machine & Supply Inc Percussion-type drill
US3322207A (en) * 1964-11-12 1967-05-30 Foster Gardner Tool Company Fluid operated percussion drill or hydraulic hammer
US3329221A (en) * 1966-03-21 1967-07-04 Shaffer Tool Works Pressure balanced bumper sub
US3410353A (en) * 1967-08-21 1968-11-12 Leo A. Martini Percussion tools
NO126144B (en) * 1970-12-07 1972-12-27 Moelven Brug As
DE2201880A1 (en) * 1972-01-15 1973-07-19 Guenter Klemm Soil/rock drill assembly - with independent rotary and percussive drills
SE463193B (en) * 1989-02-21 1990-10-22 Atlas Copco Mct Ab DEVICE WITH BATTERY MACHINERY
SE504828C2 (en) * 1990-04-11 1997-05-12 Sandvik Ab Hammer device where piston and drill bit have reverse design relative to each other in terms of impedance

Also Published As

Publication number Publication date
ZA923100B (en) 1993-06-07
JP3242445B2 (en) 2001-12-25
DE69213331D1 (en) 1996-10-10
FI97417B (en) 1996-08-30
CA2067616C (en) 2002-10-22
AU647924B2 (en) 1994-03-31
JPH07189579A (en) 1995-07-28
FI97417C (en) 1996-12-10
US5207280A (en) 1993-05-04
AU1729092A (en) 1992-12-03
CA2067616A1 (en) 1992-12-01
FI922511A0 (en) 1992-05-29
SE468443B (en) 1993-01-18
ATE142305T1 (en) 1996-09-15
SE9101639L (en) 1992-12-01
SE9101639D0 (en) 1991-05-30
FI922511A (en) 1992-12-01
EP0516599A1 (en) 1992-12-02
DE69213331T2 (en) 1997-06-12
ES2093240T3 (en) 1996-12-16

Similar Documents

Publication Publication Date Title
EP0516599B1 (en) Device in hammer machines
EP0634559B1 (en) Fluid driven down-the-hole drilling machine
EP0565500B1 (en) Rock drilling device
EP0387218B1 (en) Device in impact machines
EP0564427B1 (en) Down-the-hole drilling machine
EP0387217B1 (en) Device in impact machines
EP0198809A2 (en) Rock drilling device and a drill stem for said device
AU2006287962A1 (en) A one-piece drill bit for single-pass anchor bolting and single pass drilling apparatus
GB2255365A (en) Drilling device
WO1998012410A1 (en) Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device
GB9821048D0 (en) Percussive core barrel
CA2322693C (en) An arrangement for drilling slots
SE8302376L (en) LEAFABLE FRAME FOR MACHINE CUTTING MACHINES, GRANITE AND HARD STONE
WO2002036926A1 (en) Rock drilling machine
JPS6332224Y2 (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT CH DE ES FR GB IT LI

17P Request for examination filed

Effective date: 19930517

17Q First examination report despatched

Effective date: 19951109

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH DE ES FR GB IT LI

REF Corresponds to:

Ref document number: 142305

Country of ref document: AT

Date of ref document: 19960915

Kind code of ref document: T

ET Fr: translation filed
REF Corresponds to:

Ref document number: 69213331

Country of ref document: DE

Date of ref document: 19961010

ITF It: translation for a ep patent filed

Owner name: ORGANIZZAZIONE D'AGOSTINI

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2093240

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20110406

Year of fee payment: 20

Ref country code: CH

Payment date: 20110412

Year of fee payment: 20

Ref country code: ES

Payment date: 20110518

Year of fee payment: 20

Ref country code: FR

Payment date: 20110426

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20110413

Year of fee payment: 20

Ref country code: AT

Payment date: 20110328

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20110419

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69213331

Country of ref document: DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69213331

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20120412

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20120414

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20120412

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK07

Ref document number: 142305

Country of ref document: AT

Kind code of ref document: T

Effective date: 20120413

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20130717

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20120414